The reduction of protons to hydrogen gas occurs according to the following react

Question

The reduction of protons to hydrogen gas occurs according to the following reaction and standard potential: 2H^+(aq) +2e^- H2(g) E=0 Consider a hydrogen electrode in HBr(aq) at 25 degrees C operating at a pressure of 1.45 bar. If the pressure of the electrode is kept constant but the concentration of the solution is changed from 5.0 mmol L^-1 to 15.0 mmol L^- acid what is the change in the electrode potential A. 28 mV B. Not enough information C. -28 mV The reduction of protons to hydrogen gas occurs according to the following reaction and standard potential: 2H^+(aq) +2e^- H2(g) E=0 Consider a hydrogen electrode in HBr(aq) at 25 degrees C operating at a pressure of 1.45 bar. If the pressure of the electrode is kept constant but the concentration of the solution is changed from 5.0 mmol L^-1 to 15.0 mmol L^- acid what is the change in the electrode potential A. 28 mV B. Not enough information C. -28 mV 2H^+(aq) +2e^- H2(g) E=0 Consider a hydrogen electrode in HBr(aq) at 25 degrees C operating at a pressure of 1.45 bar. If the pressure of the electrode is kept constant but the concentration of the solution is changed from 5.0 mmol L^-1 to 15.0 mmol L^- acid what is the change in the electrode potential A. 28 mV B. Not enough information C. -28 mV

Explanation / Answer

E1 = E° - RT/(nF)*ln(Q1)

E2 = E° - RT/(nF)*ln(Q2)

difference:

E2-E1 = - RT/(nF)*ln(Q2/Q1)

E2-E1 = - 8.314*298/(2*96500)*ln((5^2)/(15^2))

E2-E1 = + 28 mV

there is an increase, since we are increasing H+ concentration

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